新型酸盐功能化基酸盐水凝用于有效吸附和 Nd 和 Dy 从 Co 中分离 Nd 和 Dy
Yilai Zhong1, Shunyan Ning2, Kun Wu1
1State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, and School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China.
Journal of environmental management
|February 8, 2024
概括
从永久磁铁中回收稀土元素 (和) 是非常重要的. 一种新的混合水凝吸收剂有效捕获这些贵重金属,显示出高容量和选择性.
科学领域:
- 材料科学 材料科学 材料科学
- 环境化学环境化学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 对稀土元素 (REEs) 的需求不断增长,需要有效的回收方法.
- NdFeB永久磁铁是REEs的重要来源,如新 (Nd) 和 (Dy).
- 开发选择性吸附剂是将REEs从复杂混合物中分离出来的关键.
研究的目的:
- 为了合成一种新的混合水凝吸附剂用于REE回收.
- 为了研究水凝的 Nd 和 Dy 的吸附和分离能力.
- 用光谱和计算方法阐明吸附机制.
主要方法:
- 使用n-dodecyl酸盐 (DPPA) 和酸盐合成混合水凝 (DPPA/CaALG) 的sol-gel合成.
- 使用SEM-EDS和N2吸附-脱附的表征.
- 批量吸附实验用于评估Co-Nd-Dy三元系统中的性能.
- 通过FT-IR,XPS和密度功能理论 (DFT) 计算对吸附机制的分析.
主要成果:
- 成功合成了一个半孔DPPA/CaALG水凝.
- 对于 Nd (162.5 mg/g) 和 Dy (183.5 mg/g) 的高吸附能力.
- 优秀的选择性,没有观察到 (Co) 的吸附.
- 确定PO和P-O组作为活性站点,以P-OH的离子交换为主要机制.
结论:
- DPPA/CaALG水凝是从NdFeB磁铁中选择性回收Nd和Dy的有希望的材料.
- 该研究提供了对吸附机制的见解,有助于设计未来的吸附剂.
- 这项工作有助于可持续的稀土资源管理.
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